Evaluation of Pseudopteroxazole and Pseudopterosin Derivatives against Mycobacterium tuberculosis and Other Pathogens
作者:Malcolm W. B. McCulloch、Brad Haltli、Douglas H. Marchbank、Russell G. Kerr
DOI:10.3390/md10081711
日期:——
Pseudopterosins and pseudopteroxazole are intriguing marine natural products that possess notable antimicrobial activity with a commensurate lack of cytotoxicity. New semi-synthetic pseudopteroxazoles, pseudopteroquinoxalines and pseudopterosin congeners along with simple synthetic mimics of the terpene skeleton were synthesized. In order to build structure-activity relationships, a set of 29 new and previously reported compounds was assessed for in vitro antimicrobial and cytotoxic activities. A number of congeners exhibited antimicrobial activity against a range of Gram-positive bacteria including Mycobacterium tuberculosis H37Rv, with four displaying notable antitubercular activity against both replicating and non-replicating persistent forms of M. tuberculosis. One new semi-synthetic compound, 21-((1H-imidazol-5-yl)methyl)-pseudopteroxazole (7a), was more potent than the natural products pseudopterosin and pseudopteroxazole and exhibited equipotent activity against both replicating and non-replicating persistent forms of M. tuberculosis with a near absence of in vitro cytotoxicity. Pseudopteroxazole also exhibited activity against strains of M. tuberculosis H37Rv resistant to six clinically used antibiotics.
假蝶呤和假蝶呤恶唑是令人感兴趣的海洋天然产物,具有显著的抗菌活性,但缺乏相应的细胞毒性。我们合成了新的半合成假蝶呤、假蝶喹喔啉和假蝶呤同系物以及萜烯骨架的简单合成模拟物。为了建立结构-活性关系,对 29 种新化合物和以前报道过的化合物进行了体外抗菌和细胞毒性活性评估。一些同系物对包括结核分枝杆菌 H37Rv 在内的一系列革兰氏阳性细菌具有抗菌活性,其中四个同系物对复制型和非复制型结核分枝杆菌的持久型均具有显著的抗结核活性。一种新的半合成化合物 21-((1H-咪唑-5-基)甲基)-假蝶恶唑(7a)比天然产物假蝶苷和假蝶恶唑更有效,对复制型和非复制型持久型结核杆菌的活性相当,几乎没有体外细胞毒性。假蝶恶唑对六种临床常用抗生素耐药的结核杆菌 H37Rv 株也有活性。